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Alloy 20 Pipe Fittings

Alloy 20 Pipe Fittings Specifications

Material Grades

  • Alloy 20
  • ASTM B366
  • UNS N08020
  • Werkstoff No. 2.4660
  • EN NiCr20CuMo
  • AFNOR Z2NCUD31-20AZ
  • Incoloy 20
  • Carpenter 20

Fittings Types

  • 90 Degree Elbow
  • 45 Degree Elbow
  • 180 Degree Return Elbow
  • Equal Tee
  • Reducing Tee
  • Concentric Reducer
  • Eccentric Reducer
  • Pipe Cap
  • Stub End
  • Bend
  • Adapter
  • Wye
  • Cross

Manufacturing Standards

  • ASTM B366
  • ASME B16.9
  • ASME B16.28
  • MSS-SP-43 Type A
  • MSS-SP-43 Type B
  • JIS B2312
  • JIS B2313
  • EN
  • JIS
  • NPT
  • DIN
  • ISO

Size & Schedule

  • Size: NPS 1/2" – NPS 48"
  • Schedule: 20S – 180S
  • Schedule 10S
  • Schedule 40S
  • Schedule 80S
  • Standard Sizes
  • Custom Sizes Available

Connection & Pressure

  • Clamp End
  • Flange Connection
  • End Bell
  • Threaded Connection
  • Weld Connection
  • Butt Weld Connection
  • Pressure Class: 150 – 2500

Mechanical Properties

  • Tensile Strength: 551 MPa Min.
  • Tensile Strength: 80,000 psi Min.
  • Yield Strength: 241 MPa Min.
  • Yield Strength: 35,000 psi Min.
  • Elongation: 30% Min.

Chemical Composition

  • Carbon (C): 0.07% Max.
  • Manganese (Mn): 2.00% Max.
  • Silicon (Si): 1.00% Max.
  • Sulfur (S): 0.035% Max.
  • Copper (Cu): 3.00–4.00%
  • Nickel (Ni): 32.00–38.00%
  • Chromium (Cr): 19.00–21.00%
  • Iron (Fe): 29.85% Min.
  • Molybdenum (Mo): 2.00–3.00%
  • Phosphorus (P): 0.045% Max.

Physical Properties

  • Density: 8.1 g/cm³
  • Melting Point: 1443°C
  • Melting Point: 2430°F
  • High Corrosion Resistance
  • Resistance to Sulphuric Acid
  • Resistance to Chloride Stress Corrosion Cracking

Material Characteristics

  • Excellent Corrosion Resistance
  • High Strength
  • Good Mechanical Properties
  • Resistance to Sulphuric Acid
  • Resistance to Chloride Stress Corrosion Cracking
  • Suitable for Chemical Processing

Alloy 20 Pipe Fittings Dimension Chart

NPS O.D. (mm) O.D. (inch) 90° LR Elbow
Center to Face
90° SR Elbow
Center to Face
45° Elbow
Center to Face
180° Return
Center to Center
180° Return
Back to Face
1/2" 21.3 0.840 1 1/2" – 5/8" 2" 1 7/8"
3/4" 26.7 1.050 1 1/8" – 7/16" 2 1/4" 1 11/16"
1" 33.4 1.315 1 1/2" 1" 7/8" 3" 2 3/16"
1 1/4" 42.2 1.660 1 7/8" 1 1/4" 1" 3 3/4" 2 3/4"
1 1/2" 48.3 1.900 2 1/4" 1 1/2" 1 1/8" 4 1/2" 3 1/4"
2" 60.3 2.375 3" 2" 1 3/8" 6" 4 3/16"
2 1/2" 73.0 2.875 3 3/4" 2 1/2" 1 3/4" 7 1/2" 5 3/16"
3" 88.9 3.500 4 1/2" 3" 2" 9" 6 1/4"
3 1/2" 101.6 4.000 5 1/4" 3 1/2" 2 1/4" 10 1/2" 7 1/4"
4" 114.3 4.500 6" 4" 2 1/2" 12" 8 1/4"
5" 141.3 5.563 7 1/2" 5" 3 1/8" 15" 10 5/16"
6" 168.3 6.625 9" 6" 3 3/4" 18" 12 5/16"
8" 219.1 8.625 12" 8" 5" 24" 16 5/16"
10" 273.1 10.750 15" 10" 6 1/4" 30" 20 3/8"
12" 323.9 12.750 18" 12" 7 1/2" 36" 24 3/8"

Alloy 20 Pipe Fittings Weight Chart

DN Schedule 10S Weight (kg/pc) Schedule 40S Weight (kg/pc) Schedule 80S Weight (kg/pc)
90° Elbow 45° Elbow Equal Tee 90° Elbow 45° Elbow Equal Tee 90° Elbow 45° Elbow Equal Tee
8 0.02 0.01 0.03 0.03 0.02 0.06 0.04 0.03 0.07
10 0.03 0.02 0.05 0.03 0.02 0.03 0.06 0.04 0.09
15 0.06 0.03 0.09 0.08 0.04 0.10 0.10 0.05 0.14
20 0.07 0.03 0.13 0.08 0.04 0.17 0.11 0.05 0.20
25 0.14 0.08 0.28 0.15 0.11 0.29 0.22 0.14 0.38
32 0.23 0.11 0.49 0.26 0.17 0.59 0.40 0.23 0.68
40 0.30 0.17 0.68 0.40 0.23 0.86 0.51 0.29 1.02
50 0.50 0.25 0.85 0.70 0.40 1.28 0.91 0.59 1.59
65 0.85 0.48 1.41 1.40 0.77 2.19 1.81 0.99 3.13
80 1.25 0.63 1.77 2.20 1.08 3.31 2.97 1.50 4.45
90 1.70 0.75 2.67 2.83 1.42 4.08 4.00 2.00 5.44
100 2.10 1.08 3.46 4.47 2.09 5.27 6.18 2.81 7.71
150 5.45 2.72 8.07 10.89 5.44 10.99 16.32 8.16 13.61
200 10.20 5.33 15.65 21.54 10.77 20.91 33.11 16.56 28.12
250 18.15 9.75 26.46 38.56 19.27 35.38 51.71 25.86 49.90
300 25.80 13.62 39.46 59.42 29.71 62.14 79.38 39.69 83.91

Alloy 20 Reducer & Unequal Tee Weight Chart

DN Schedule 10S (kg/pc) Schedule 40S (kg/pc) Schedule 80S (kg/pc)
Concentric Reducer Eccentric Reducer Reducing Tee Concentric Reducer Eccentric Reducer Reducing Tee Concentric Reducer Eccentric Reducer Reducing Tee
40 × 25 0.19 0.19 0.60 0.26 0.26 0.76 0.34 0.34 0.90
50 × 25 0.28 0.28 0.73 0.40 0.40 1.10 0.54 0.54 1.37
50 × 40 0.31 0.31 0.76 0.45 0.45 1.15 0.59 0.59 1.43
80 × 50 0.55 0.55 1.56 1.00 1.00 2.91 1.79 1.79 3.91
100 × 50 0.78 0.78 2.94 1.50 1.50 4.48 1.95 1.95 6.55
100 × 80 0.87 0.87 3.04 1.74 1.74 4.64 2.33 2.33 6.79
150 × 80 1.82 1.82 6.86 3.95 3.95 9.68 5.51 5.51 11.57
150 × 100 1.96 1.96 7.10 4.07 4.07 11.94 5.96 5.96 11.97
200 × 100 3.01 3.01 13.46 6.55 6.55 17.98 9.23 9.23 24.18
200 × 150 3.19 3.19 14.08 6.74 6.74 18.82 10.12 10.12 25.31

Chemical Composition

Carbon (C)
0.07% max
Manganese (Mn)
2.00% max
Silicon (Si)
1.00% max
Sulfur (S)
0.035% max
Copper (Cu)
3.00–4.00%
Nickel (Ni)
32.00–38.00%
Chromium (Cr)
19.00–21.00%
Iron (Fe)
29.85% min
Molybdenum (Mo)
2.00–3.00%
Phosphorus (P)
0.045% max
Density: 8.1 g/cm³
Melting Point: 1443°C
Melting Point: 2430°F
Corrosion Resistance: Excellent

Mechanical Performance

551
MPa (80,000 psi)
Tensile Strength
241
MPa (35,000 psi)
Yield Strength
30%
minimum
Elongation
8.1
g/cm³
Density

Alloy 20 Pipe Fittings Pressure-Temperature Rating

Temperature °F Temperature °C Class 150
1/4"–1"
Class 300
1 1/4"–2"
Class 300
2 1/2"–3"
Pressure Rating
-20 to 150 -29 to 66 300 psig 2000 psig 1500 psig 1000 psig
200 93 265 psig 1785 psig 1350 psig 910 psig
250 121 225 psig 1575 psig 1200 psig 825 psig
300 149 185 psig 1360 psig 1050 psig 735 psig
350 177 150 psig 1150 psig 900 psig 650 psig
400 204 – 935 psig 750 psig 560 psig
450 232 – 725 psig 600 psig 475 psig
500 260 – 510 psig 450 psig 385 psig
550 288 – 300 psig 300 psig 300 psig

Alloy 20 Pipe Fittings Tolerance

NPS Outside Diameter at Bevel Inside Diameter at End Wall Thickness Center-to-End Dimension Overall Length H Overall Length F
1/2" – 2 1/2" +0.06 / -0.03" — Not less than 87.5% of nominal thickness ±0.06" ±0.06" ±0.12"
3" – 3 1/2" ±0.06" ±0.06" ±0.06" ±0.06" ±0.06" ±0.12"
4" ±0.06" ±0.06" ±0.06" ±0.06" ±0.06" ±0.12"
5" – 8" ±0.06" ±0.06" ±0.06" ±0.06" ±0.06" ±0.25"
10" – 18" +0.16 / -0.12" ±0.12" ±0.09" ±0.09" ±0.09" ±0.25"
20" – 24" +0.25 / -0.19" ±0.19" ±0.09" ±0.09" ±0.09" ±0.25"
26" – 30" +0.25 / -0.19" ±0.19" ±0.12" ±0.19" ±0.19" ±0.38"
32" – 48" +0.25 / -0.19" ±0.19" ±0.19" ±0.19" ±0.19" ±0.38"


MANUFACTURING

Forging Process

Each flange follows a rigorous 8-step forging and quality-control process to ensure conformance with ASTM A182 and ASME standards.

1

Material Selection

Prime 304 stainless steel billet sourced and certified.

2

Billet Preparation

Heat to 1100°C – 1250°C for optimal forgeability.

3

Forging

Shape billet into flange geometry under controlled pressure.

4

Heat Treatment

Solution anneal at 1040°C – 1120°C, then quench.

5

Machining & Finishing

CNC machining, drilling, and surface finishing.

6

Testing & Inspection

Tensile, hardness, PMI, visual and impact tests performed.